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姓名 英萬(Irwan)  查詢紙本館藏   畢業系所 地球物理研究所
論文名稱 大地電磁影像加強了解地熱構造:宜蘭清水地熱案例
(Magnetotelluric Imaging Improves Understanding of Geothermal System: Case in Chingshui Geothermal Area, Northeastern Taiwan)
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摘要(中) 清水地熱是台灣發展最完整之地熱區,其熱源來自入侵淺部(~2km)之火成岩體造成高地熱流與地溫梯度,變質砂岩中一些東北向深部斷層系統提供天水深循環(3He/4He比值)之熱水通路。本研究再處理原資料,包括二維模擬及逆推,結果顯示(圖5.2) 沿清水斷之低電阻異常(C1 與 C2)
是清水地熱儲集層,其上之粘土化礦物屬地熱蓋層。清水斷層是熱水上升至地表之主要通道,此外,高電阻多裂隙(微震密集)圍岩R2以及東側鄰近之火成入侵體R1屬清水地熱熱源。
本研究最重要之發現是在淺部C1與C2 5Km下存在深部區域性低電
阻異常C3,兩者彼此經由清水斷層相連,C3可能是未來清水地熱發展加強型地熱主要目標。大地電磁併合地質、地物以及地化確實加強了解清 水地熱構造。
摘要(英) The well known geothermal field in Taiwan is Chingshui geothermal area (CGA). The existence of a shallow (~2km) intrusive igneous rock results in a high heat flow and geothermal gradient. The NE deep fault system within the meta-sandstones provides meteoric recharge from a higher elevation to artesianally drive the geothermal system. This study reprocess the 2D modeling and inversion of CGA MT data. The result (Fig. 5.2) shows that anomalously conductive (3-100 ?m) zones, C1 and C2, obtained along the Chingshui fault may represent the geothermal reservoir in this area and the cap formed by clay mineral on top of it. Chingshui fault may act as a main conduit for fluid migration toward the surface. Meanwhile, the high resistivity (300-1000 ?m) host rock, with high temperature gradient and fracture dominated (seismicity indicated) (R2), together with the magma intrusion nearby (R1) represent the possible heat source of CGA.
The most interesting feature of this study is the finding of another deeper conductor (C3). C3 conductor is at about 5 km beneath the shallow conductor C1 and C2. All conductors (C1, C2 and C3) in CGA are connected each other by Chingshui fault. However, C3 conductor is most probably the highest potential for enhanced or engineered geothermal system (EGS) in CGA as it owns regional, rather local, enhanced hear and fluid. MT sounding technique, by joint interpretation with geology, geophysical and geochemical information does improve understanding of the geothermal system.
關鍵字(中) ★ 清水地熱
★ 地熱系統
★ 大地電磁法
關鍵字(英) ★ magnetotelluric
★ Chingshui geothermal area.
★ geothermal system
論文目次 Chinese abstract...............................i
English abstract...............................ii
Acknowledgements...............................iv
Table of Contents...............................iv
List of Figures...............................vi
List of Tables...............................iv
Explanation of Symbols...............................iv
Chapter 1 Introduction...............................1
1.1 Conceptual models of geothermal areas..............1
1.2 Chingshui geothermal area...................2
1.2.1 Surface Manifestation...................2
1.2.2 Previous Studies in CGA...................2
1.3 Geological and geothermal background of the CGA...3
1.4 Thermal Structure in Taiwan...................4
1.4 This thesis...................5
Chapter 2 Magnetotelluric Method...................12
2.1 Magnetotellurics...................12
2.2 Basic principal of MT...................13
2.3 Electrical properties of rock...................16
2.4 MT impedance over a two dimensional earth.........18
2.5 Dimensionality and distortion...................20
2.5.1 Rotation and decomposition methods...............21
2.5.2 The MT phase tensor...................22
2.6 Static shifts...................23
Chapter 3 Magnetotelluric Data Processing................28
3.1 Magnetotelluric data collection...................28
3.2 Magnetotelluric time series analysis..............29
3.3 Dimensionality and distortion...................29
3.3.1 Phase tensor analysis...................30
3.3.2 Phase tensor with CGA...................31
3.4 MT sounding curves and pseudo-sections...........32
3.5 Static shift correction...........32
Chapter 4 Inversion of MT Data and Sensitivity Tests......42
4.1 Inversion Theory...........42
4.2 Inversion of the CGA MT Data...........44
4.3 Smoothing test...........45
4.4 Sensitivity test...........45
Chapter 5 Interpretation of the CGA Resistivity Model....60
5.1 Interpretation...........60
5.1.1 NW-SE profile...........60
5.1.1 SW-NE profile...........60
5.2 Conceptual models of CGA...........60
Chapter 6 Conclusions, Discussions, and Future Work......65
References...........66
Appendix A MT Data and 2D Inversions Respons...........70
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指導教授 陳洲生(Chow-Son Chen) 審核日期 2012-6-25
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